My family is full of people who appear immune. My sister will wear a mask when flying, in healthcare settings or otherwise when requested but nowhere else. She's had countless direct exposures, including when her partner gets it and has never shown any symptoms. My grandparents all take zero precautions and live in group homes and yet have never had it. My mom does take precautions but wasn't thaaat careful when my dad had it (they live together) and never showed symptoms.
Simce they're close family I know for a fact they've never shown symptoms and aren't getting sick. Idk what to think
most college libraries have a great collection and sometimes offer a free card to the general public